Telephone system



APY'll 5 1927 R. E. KING ET Al.

TELEPHONE SYSTEM,y

Filed April 3,0, 1926 Patented pryS, i927. i

nutren gsrAres- PATENT OFFICE RALPH' E. KING, yor EAsT ORANGE, ANI) WILLIAM M. BEAUMONT, Or SUMMIT, vNaw JERSEY, jAssIGNORs TO' BnnLfTnLnrHONn LABORATORIES, INCORPORATED, or. NEW YORK, N. Y., A CORPORATION or NEW YORK. y

TELEPHONE SYSTEM.

Application filed April 30, 1926. Serial NO..105,704.

rlilhis invention relates to'telephone systems and more particularly to systems in which manual lines may be connected to either manual or automat-ic lines.

in systems of `this kind interoiiice trunks may be involved that extend' from A Operators positions` ina manual eX- change to BOperators-positions in distant eKchangesNi-rom which connections maybe made to both manual andautomatic suhscribers.' Call wire. "circuits, extending bebetween vthese two kinds oi" operators are usuallyemployed for assigning interoftice trunks yfor usein vconnections and for com; .niunjicating the information relating to the' establishing of connections thereover.. The l interotiice trunks arefprovided 'at their terminating ends with equipments whereby the B operators may dial automatic subscribers designations. y i i It is the principal objectot' this invention `to improvethe supervision Ot theestablish-` in'gr otconnections over interoiicetrunks Ot this general character. Y, To" attain thisand other objects there is provided in accordance with one feature of the invention means whereby a busy tone is appfiedto the call wire circuit when a B Operator is engaged in dialing for an automatic subsci'ibens line,`as an indication to the iU'Operator that she is so engaged. v

The invention further contemplates the provision ot.' means whereby, on the opera# tion ot the dial key ot' the assigned trunk for connecting the dialing circuit to this trunk, a pilot lamp in the dialing circuit is lighted andthev usual guard or disconnect lamp in the assigned trunk is fla-shed. They lighting' ot'f the pilot lamp indicates to the B Operator that the diaiing circuit has been connected .to a trunk, vand the dashing oi a `guard and disconnect lamp indicates the tri'ink to which the dialing circuit has been connected.

ArceOrding1 to the invention there is also provided a dial lockout arrangement which renders the operation ot all dial keyswithout eie'ct'while the dial is actively associated Tith anyone trunk. iThus'the accidental op'erationofa diaikeyT on one trunk will not y disturb 'tihedialing operation-s taking place on another trunk, nor will an established-conf supervisory signaling means.

sociated therewith is dial key nection on any one trunk be disturbed by the p accidental operation of the associated' dial key while Lthe dial is thus actively associated with another' trunk.

Further, this invention provides improved Ordinarily, when a trunk has been seized at the Outgoing end and then extended atfits incoming-end `to an outgoing trunk, the guard lamp wi'liiight steadily and when the proper dialley1 has been depressed, such lamp will liash` to ',idica-te to which particular trunk the dialing circuit` has been connectedand the dial pilot will burn steadily to indicate that the dialing circuit is .in order. H55 however, a dialk'ey of another trunk is accidentally op# erated, then the guard` lamp will not flash.

VIn this case the dial pilot'will light 'as `-au indication that the 'dialing circuit has been taken for use with some trunk, but which trunk is unknown so that it wiil'be necessary to release the dial circuit anddepress the" proper dial key. p

This invention has been illustrated inan accompanying ,drawing in which is shown the; incoming end ot an interotlice trunk terminating 'at a B operators .position anda dialing' circuit which is common to a pi' trunks oi the kind illustrated.

Referring now to the drawing ythe invention has been illustrated in connection with an` inl'crotiice rtrunk circuit l incoming toa B operators position at'oneexchanee from. an A operators position at a distant exchange.- Thisftrunkywhich is one ofa plurality ot similar trunks presided over by a` B operator, terminates in a plug, 2 by means of which the trunk may be extended` Ring-V to automatic or manual subscribers. ing key unit 8, ot the usual type, is provided for ringing connected subscribers, and fas 5 for associating crcuit. This 'dialing circuit'is common to all incoming trunks terminating at this B 'operators position.v The dialing circuit is pro# vided with a dial 7 and an operators telel phone set 8. The telephone-set is connected to call wire 9 lea-ding to the. A `operators position at" a distant exchange and over which conversation may take place between the A and B operators relating to the` this trunk circuit with the dialing loo assignment of interoiiice trunks and to the establishingof connections tliereoyer to wanted subscribers lines.

'llo more iully set forth the various 'teatures ot this invention detailed descriptions will now be made ot' the tunctions of this trunk circuit when used in establishing a connection to a manual subscribefs line. tollowed by a description ol. the functioningr ot this circuit' and the dialing circuit when used in establishingI a connection to a subs" iber whose line terminates in an automatic exchange. ln the first case plug 2 will he inserted into the jack and in the second case the plug 2 will be inserted into the liack ll. vlack 10 may be connected through a manual exchange to a manual sub scribers line or directly to a manual subscribers line, while jack 11 may be connected through the usual automatic switches in an automatic exchange to an automatic suhsL-cribens line in a manner well known in the art.

lil a connection to be. completed to a manual subscribei"s line the A operator at the distant exchange notities the B operator oycr the order wire 9 ot the number ot the wanted subscriber and ssians a trunk such as l over which the connection is to be rzttcnded. t. should be understood that the B opcrators telephone set S is connected through plugs 12 and jacks 13 to the dialing circuit when the B operator is in attendance at the position and removed trom the dialing circuit when the B operator is absent from the position. Relay 15 is therefore normally actuated over an obvious circuit through the transmitter and the secondary of induction coil 16 so that the conductors of the order wire are connected through the contacts of relay 15 to the primary ot the induction coil 1t. YIt' it is assumed that the B operator has received the number ot' the wanted manual subscriber and the B operator has assigned the trunk 1 'for use in this connection, relay 18 will operate. rlhe operation of relay 1S is due to it beine' connected across the tip and ring conductors ot' trunk l through battery at the A operators position in a mann-:fr well known in the art. The operation oi relay 18 closes a circuit. 'for the operation ot the guard and disconnect lamp 19 over a circuit as follows: battery, lamp 19, armature and `lront contact ot' relay 1S. inner lower armature and back contact ot relay 20, lower winding` ot relay Q0 to ground. Relay 2() does not operate in this circuit. T he light.- inp; ot' lamp 19 indicates to the E operator that the connection is to be extended over trunk 1. She will thereupon test liack 10 of the wanted subscribers line in the usual manner by touching the tip of plug 2 to the slee-fc of jack 10. It this subseribers line is 'l'ound 'to be idle she will insert plug Q into jack 10 and relay 2O will operate over the sleeve circuit. relay 20 in operating); disconnects the busy test; lead trom the tip conductor ot trunk 1 and connects this conductor to contacts of relay Q1. This relay 20 also in operating connects relay 22 in parallel with lamp 19 and thereby shunts and cXtinguishc-s the lamp and causes' the operation o't relay Q2 over a circuit as follows: battery, windin` ol relay armature and back contact of relay 23, armature and back contact ot relay Qfl, inner lower armature and tront contact ot relay 2t), armature and front contact of relay 18, upper winding,Y of relay 2t), sleeyc terminals ot' plug' 2 and jack 10 to ground.

The operation ot relay connects the ringing key set 2l to the wanted subscribcrs line and removes the short-circuit trom across the condenscrs Ztl and QT. As indicated this circuit arranged ior vtour-party ringing and one of the keys olf the ringing key set 3, tor example lV, is actuated as the ringing key set 3 is seli'-locking. The key lV applies the ringing tor the tirst party ol a four-party line, or tor the. single party ol a single party line. The application ot' ringing current in this case would then be over circuits as follows: ground will be applied through the upper armature and back contact oi? relay 2) to the upper arn'iature and l'ront contact ot relay through the tip conductor ot' the trunk 1 while negative superimposed ringing will be applied l'rom source through the lett-hand winding ot ringing relay 2l, lett-hand operated contacts of key lV, the lower armature and liront Contact ot relay to the ring conductor ot the trunk. It the jack 10 is connected with a tour-party line and party M is wanted, the key having` this designation will be operated and relay 29 will operate over the iollowing circuit: from battery through the in terrupter 31, inake-betore-break contacts ot relay 29, winding of relay 2S), lower outer arn'iature and trout contact ot relay Lt). right-hand normal contacts of keys llt', R and J to ground at the right-hand operated contacts ol key M. Relay 25) locks through its lower armature and front contact to battery and the ringing current applied to the line in this crse will be as follows: trom lground through the lett-hand normal contacts of keys R and Y, lower. armature and .front contact ot relay to ring conductor oli trunk 1, while positive superimposed ringingl current troni source :31 through the right-hand winding ot ringing; relay "1l-l, will be applied through the lett-hand operated contacts of key H, lett-hand normal contact of' key J, upper armature and front contact of relay 29, the upper armature and front contact ot relay 22 to the tip conductor of trunk 1. It party J is to be rung the operation ot key J will also cause thc opcra ion ntt relay 29,-'in this'casey ground will: be`- sua key Jr for. relay 29,.while ringing ground will be supplied through thenormal lefthand .contactsct keysyR- and W, the lower the ring side of trunk l, and'negative superimposed ringing current froni Source 50 through the left-hand winding of .relay 24 and le-ftfhandl operatedA contactsI ofkey J armature and ,fronti con-act oli` relay. 22. tov

and iupper armature and :front contacts ot re-V` lay 29, the upper armature. and front con tact oiirelay 22 to the tip` conductor oft trank l. 'It party R is ythepartywanted, key` R will `he operated and groundin this case will be supplied, to* the, tip conductor o'l: trunk l through the upper armature and back con tact of relay 29- andk upper armature and lirontv `Contact of relayl 22,9 whilel positive superimposed ringing `current ,fromsource 5,1 will be connected through the right-hand winding of relay 24l,-leftliand operated contacts of key B, left-hand normalwcontaets ot key W7, lower armature andfront conta-'ctot relay 22 to the ringcondnetor of'trunk` l. lt will be noted that ringing current is started under control of a pick-up` interruptor' Elin the case of'parties M and J'and is startedimmediately and notl under con-` ltrol of such interruptor inthe case ot pare ties andVV; The function ottlaegpickfup interru'pter is tocause the energiaationl ot' the reversinrgrelay 29 so that'in the case; ot

parties ,M and/J, thel ringing-current is con- `nectedfto the tipconductor with` a return? path tosgrou-nd ,over tl-re'ringlng conductor, whereas m the case otparties R and W, the

ringing current' is connected to the ring con-f ductor withla' return pathptofground over fthe tip conductors` Thewpickenp interruptor is arranged to cause 4the operation of relay -29 during .the silent, interval, .the sources 50 and lbeing associated w'ithathe .usual internpter, lso thatV ringing current is supplied for ashort interval and' thenfbattery currenttor a short inter 'alnanzcl so on.- Since;v

the operators sometimes depress tlieringing keys before'- inserting the vplu-g inthe jackot the called: hn'e,-itpis= desirable to keep ringing current oit theitip of the lplug` while" 1t is passing over the ring spring ofthe-jack in: order to prevent `false*r ringingof the R' or N party. "Fheretore1 should relay. 29 operate. at such a time under control .of pickup interrupter and thev lower f armature? ot relay 20,1*ing'in'g currentwill not flowfrom thetip of the plug 2 to the ring spring of ack l0 and falsely ring party R or party lV., 'During the ringingzota wanted sub-' scribers line part ofthe ringing current will How through thecondensers 26 and'27 through the right-handwindingsof repeating coilfand ringing toney is thereby indnced ini the left-hand windings ot this repeating f coilfover the trunkl to the All `circuits for relay Relay 22 also inreleasingshort-circuitsthe,

y voperator and: subscriber at the dis-tant ex,- plied attheoperated righteha-nd Contact? olii chauffe. This serves asfanfindication to Athe' c ,n :D

A operator and subscriber that; ringing current isbeing applied to theline of the wanted. subscriber. i

1rvVlien the subscriberat the called station answersby removing the: receiver from the` operates' in series with-relay 22yover ay circuit as follows: battery winding ot relay r 1 .n 22,. lower and noimal make-beiore-break contacts of relay 2l, winding of relay 43, a

inner lower armature and front contact ot' relay 20, armatureiand vfront contact of relay 18, upper-rwinding ol' relay 20,: sleeve terminals of plug 2 and jiack lOto'groundf. Relay 23; in operating short-circuits and releases the relay 22 and/the winding of relay 23 now acts as a. shunt across the and disconnect lamp 19, keeping it extinguished. Relay 22 in releasing. opens the 241 which also releases.

condensers 26 and 27 ,andfconnects the tip and ringconductor intrunkl throughto the repeatlngcoil 35. Relay;y 37lis thereby operated and this relaynow short-circuits the high' resistance winding `of yrelay 18 which will have the eilect at the distant A operators position of extinguishing a. supervisory lamp, as is wellknown in .they art, yto indicate that: the wanted subscriber khasbeen connectedto the trunk and that conversation between the calling-and called The operashort-circuit guard HPU subscriber mayv now take placev over this connection.

l/Vhen the conversation ceases andv the called subscriber hangs'uputhe receiver, re-

lay 37 is released and removesthe shortoircu-it from thehigli resistance winding ot relay. i8 thus causing the supervisory lamp atthe A operators position at the distan-t exchange to be lighted as a disconnect signal. rlhe A opera-tor new removes the plug Vof the connected cord troni the jack of this trunk liner and this causes the release oit relay 18 which in turn causesthe release ofzrelay: 23. The release oi'wthese relays permits' the lamp-.19? to-be lighted as a disconnectsignal torthe B operator.Y The B oper ator now removes plug52- fromA jackal()A thus causes the `release. of all A associated f ren lays and-the extinguishii'ig of tlieelamp. 19, thus restoring therircuits of trunk `l 'to norma-l condition. i

It the wantedA subscriber is one that may be reached throughV switches of an automatic exchange the-1B operator will .insert plug: 2 into jack l1 whichniaybe connected in any well known manner to an automatic exchange. This con-nection'causes the opguard and". disconnect los y eration ot relay 2O in the same manner as previously described. The B operator now operates the dial key 5 to associate the dial circuit with the trunk 1 so that the operations ot dial 7 tor the selection of the wanted subscribers line in the automatic exchange may take place. rThe ogeration of the dial key closes a circuit tor the operation of relay 21 as follows: battery Windn ing ol relay 21, operated contacts ot dial key 5, make-beore-break contacts ot' relay 38, lower armature and back contact ot relay 39 to ground. Relay 21 in operating connects the tip and ring conductors ot' trunk l to the dial circuit through leads 4() and 41 extending to the dial 7 and causes the operation of relay over the circuit as follows: battery Winding of relay 38, inner upper armature and front contact ot relay 2l, cont-acts ot' dial key 5, make-beforebreak cont-acts of relay 38, lower armature and back contact of relay 39 to ground. Rclay 38 in operating pro ldes a locking circuit for itselt' through its outer lett-hand armature and front contact to the ground at the lower armature oi relay 39. rl`he operation of relay 38 also provides a locking circuit 'for relay 21 to the same ground atI relay 39. The operation ot relay 38 further closes obvious circuits tor the actuation of pilot lamp 42 and for the operation ot relay 43.

TiJilot lamp 42 is lighted to indicate to the i3 operator that the dialing circuit has been connected to a trunk and the operation ot relay 43 disconnects the operators telephone set 8 from the call wire circuit 9 and connects instead thereto the secondary winding ot a repeating coil 44, the primary ot which is connected to a tone source 45. Thus the tact that the dialing circuit has been connected to a trunk is indicated to the A operator at the distant exchange by a tone applied to the call wire circuit. in other Words this tone on the call wire circuit will indicate to the A operator at the distant exchange that the B operator is engaged in establishing a connee tion with an automatic subscriber involving tne dialing circuit. t

Another circuit closed by the operation of relay 38 is that for relay 46 as follows: battery Winding of relay 4G, right-hand armature and ront cont-act of rela-y 38 to interrupter 47. lThis circuit for relay 4G is alternately opened and closed through the operation of interrupter 47 so that this relay will alternately open and close a circuit for alternate operation and release ot' relay 23 which thus causes the flashing of the guard and disconnect lamp 19 by the alternate short-circuiting ot the circuit thereof. The dashing of the guard and disconnect signal 19 indicates to the B operator that the dialing circuit has been connected to this particular trunk and that the circuits for the dialing of the number of the Wanted sub scriber arc now completed and that dialing may be begun.

Vhen dial 7 is operated relay 48 will operate over a circuit as follows: trom ground.y winding ot' relay 48, oit normal contacts ot dial 7 lead 41, lower outer arn'iature and tront contact ot relay 21, the ring conductor ot trunk 1, ring tern'iinals ot plug 2 and jack 1l to battery through a relay (not shown) in the outgoing trunk circuit. When the dial is returned to normal ground impulses are passed over lead 40, tip conductor ot trunk l, the tip terminals of plug 2 and jack 1l through a pulsing relay in the trunk circuit to battery thereby causing` this relay to be actuated to operate switching mechanisms in the automatic telephone system to select theV desired subscribers number in a manner well known in the art. An outgoing trunk circuit adapted to 'unction with applicants arrangement is shown in l1` ig. 3 ot Patent No. 1,567,256, issued December 29. 1925. to C. B. Fowler. W'hen dial 7 returns to normal relay 48 is released and lead 41 is connected through a resistance and liattcry to ground. 1t is, ot course, understood that the dial 7 is operated once ior each digit ot the wanted subscribers number. llfhen the dialing is completed the B Operator operates the master release key 49 causing thc operation of relay 39 over an obvious circuit. Relay 39 in operating locks temporarily under the control ot relay 38 and removes the ground from the Winding oi" relay 38 thus causing the release of relay 38. Relay 39 also by operating its upper armature opens the circuit for relay 43 so that the tone 'from source is disconnected from the call wire circuit 9 and the operators telephone set 8 is reconnected to the call wire circuit. 'lhc release ot relay 38 cxtinguishes the pilot lamp 42 and releases relay 4G. The release ot' this relay also causes the release o1 relay 21 so that the flashing of lamp 19 will be discontinued and relay 23 locked in operated position to the tip terminals of plug 2 and jack 11 and lamp 19 extinguished. 'lhc release ot relay 21 also connects the tip and ring conductors of trunk 1 to the repeating coil 35. lVhen theV wanted subscriber answers in response to the usual automatic ringing by removing his receiver from the hook, relay 37 operates and short-circuits the high resistance winding ot relay 18. whereby a signal is received as previously stated at the A operators position indicating that the connection is now completed through to the Wanted subscribers line and that conversation between the calling and called subscribers may take place.

The purpose of relay 48 is to prevent the dialing circuit from being disconnected trom the trunk during a dialing period which would ordinarily take place if master key 49 `was operated before the dialing` is nished.

Relay 48 is maintained operated as stated While the dial is off normal and thus provides at its armature and front contact a ground for the maintaining of relays 38 and 21 operated until the dial has returned to normal, veven though key 49 may have been operated before this time and removed the normal ground for these relays,

v If the B operator should actuate dialing key 5 before plug 2 is inserted in jack 11 the guard and disconnect lamp 19 will not flash as relay Q3 Will not be alternately operated and released due to the fact that relay 2O will not be operated to provide a circuit for relay 23 on the operation of relay 21. It therefore follows that if a dial key of another trunk is operated While the dialing circuit. is connected to trunk 1 the functionsof the dialing circuitvwill not be disturbed. This is evident because the relay corresponding to relay 2O in this other trunk Would not ordinarily be operated. `Even if it Was operated,fthat is, if the plug of this trunk was inserted in a jack, no disturbance could take place as the rela-5138 would be operated and consequently there would be no connection for the dial key to ground in the dialing circuit for the operation of the relay corresponding to relay 2l in this trunk. What is claimed is:

1. A telephone system comprising a line, a dialing circuit, a signal associated with said line, means responsive to the seizure of the line for actuating said signal, means for connecting saidy dialing circuit Avvith said line, another line, means for connecting said lines together, and means responsive to said connections for actuating said signal in a manner different from its actuation on the seizure of the first line.

2. A telephone system comprising a line, a dialing circuit, a signal associated with said line, another signal associated with the dialing circuit, means for connecting said line and dialing circuit together, another line, means for connecting said lines together, and means responsive to said connections for actuating` said signals.

3. A telephone system comprising a line, a dialing circuit, a signal associated with said line, another signal associated with the dialing circuit, means for connecting said line and dialing circuit together, another line, means for connecting said lines together, and means responsive to said connections for actuating said signals in different Y manners.

4. A telephone system comprising a line, a dialing circuit, a signal associated With the line, a signal associated Wit-h the dialing circuit, means responsive to the seizure of the line for actuating said first associated signal, means for connecting said line and dialing circuit together, another line, means for connecting said lines together, means responsive to the first mentioned connection for actuating the dialing signal, and means responsive to both of said connections for actuating the line signal in a manner different from its actuation at the seizure of the line.

5. A telephone system comprising a line, a dialing circuit, a signal associated With Vthe dialing circuit, a call Wire circuit, a

tone source, means for connecting the line and the dialing circuit together, and means responsive to said connection for actuating said signal and for connecting the tone source to the call Wire circuit.

6. A telephone system comprising a line, a dialing circuit, a signal associated With the line, a signal associated with the dialing circuit, an operators telephone set, a call Wire circuit connected to said operators telephone set, a tone source, means for counecting said line and dialing circuit together, another line, means for connecting said lines together, means responsive to the seizure of the line for actuating the line signal, means responsive to the connection of the dialing circuit and the first mentioned line together for actuating the signal associated with the dialing circuit and for disconnecting the operators telephone set from the call Wire circuit and connecting the tone source to the call Wire circuit, and means responsive to the connection of the dialing circuit and the two lines together for k,actuating the line signal in a manner different from its actuation on the seizure of the line. In Witness whereof, we hereunto subscribe our names this 27th day of April, A. D. 1926.

RALPH E. KUNG. WILLIAM M. BEAUMONT. 

